Polishing-machine.



H. ROBINSON.

POLISHING MACHINE.

APPLICATION FILED JAN. z3, 1911.

LOBJlQ.

f5 7% /Jwf BY ATTO RN EY Patented Aug. 27, 1912.

HENRY ROBINSON, NEWARK, NEW JERSEY'.

romsmudnmcnmn.

Specification of Letters Patent.

- Application led January 23, 1911.

Patented Aug. 727, 1912. serial No. 604,091.

To all whom t may concern Be i known that I, HENRY ROBINSON, a citizen of the United States, residing in Newark, in the county of Essex and State of New Jersey, have invented a certain new vand useful Improvement in Polishing-Machines, of which the following is a specifica-tion.

My present invention relates to a ma# chine capable of being driven either by hand or power whereby knives and thevlike may be rapidly and easily cleaned, scoured or polished. A l

The vobject 'of the invention is the provision of an improved contact pad to be applied to the polishing or 'cleaning wheels,

which padv can be removed with compara-` tive ease and at the same time provides an improved cushion and surface' for contact with the articles to be treated.

Another object of the invention is the provision of a machine of. the class described which is composed of relatively few' parts s'o contrived and arranged as to be veasily assembled or taken apart.

A preferred embodiment of .my invention is illustrated in the accompanying drawings, wherein- Figure 1 is a plan view of the machine as arranged to be driven .by a motor (not shown), and Fig. 2 is a sectional detail of a preferred contact pad.

Upon the base or platform 10 are sup ported three standards, 11, 12, and 13, preferably placed as shown in Fig. l. One polishing wheel 14 is carried on the end of a hollow sleeve 15 which has a bearing inv the standard 12, while the opposite polishing wheel 16 is carried by a shaft 17 having its bearing in the standard 13. Each polishing wheel consists of a cast iron body hollowed on its outer face as indicated by the dotted lines in Fig. 1, and supplied around its rim with a suitable contact pad whose preferred construction is hereinafter described.- y

Through the cent-er of the sleeve 15 extends the shaft 18, carrying a worm wheel 19 and a gear wheel 20 at its end. The worm wheel 19 is driven by the worm 21, on the shaft of an electric motor, one end of which is shown at 22. Any driving means may be used for the shaft 1 The sleeve 15, which is made capable of sliding longitudinally on the shaft 18 carries collars 23, 24 between which turns the loose collar 25, carrying pins 26 rengaged by forks 27 on the short-er arms 28 of a lever pivoted beneath the base 10 at 29. ,The longer arm 30 of the lever extends under .i the base 10 to where a bolt v31 passes through its extremity and upward through the base, above which said bolt is pivoted to a cam 32 having a handle 33. A nut 34 at the bottom of the bolt supports the end of the arm 30, o which is pressed downward by the spring 35. f

Various means well known to those skilled in the art may be used to cause the sleeve 15 and disk 14 to turn with the driving shaft 18, and, as these form no partof my present invention, they are. not herein shown' and described.. l. The two polishing wheels 14 and 16 are lcausedto ro-tate together in the same direction by the preferred means shown, wherein the gear 2O drives a spiral toothed gear `40 cn the cross shaft 41. This shaftdrives a second spiral toothed gear 42-which drives the gear wheel 43 on the shaft 17 of the wheel 16.

The rims of the two wheels 14 and ,16 are faced with polishing pads, and the shafts 15 and 17 of these wheels are set at such aI mutual angle that these pads may be brought 46 having an extension which enters the` groove 45. This cushion is preferably made of live vrubber or equivalent material. Over the cushion 46 is stretched a leather cover ing 47 extending all the way around the wheel, the edges of which are tucked in tightly above and below the cushion, and between it and the sides of the hollow 44. Byl using a live elastic inner cushion 46 `projecting' above the edges of the cavity 44,

and covering the same in the manner above described,'I am able to produce a polishlng pad which readily accommodates itself to the different positions and stresses incident to changes in the positions of the'polishing wheels, without bringing undue strains A either upon the cushion proper or its covering.

When in operation, the Wheels Hand 16 occupy approximately the position shown in the drawings, when the knife to be polished is introduced edge up between the revolving pads at the front of the machine, the fr iction of which ypresses the back of the knife down upon the rest-48 placed just in front` of the point olf/contact of the pads. By

pushing the knife in and out between the pads, all parts of the blade may be broughtshown the spring 35 is allowed to depress the outer end of the arm 30 to a maximum extent, thus bringing the pads into rm con tact. By tilting the handle 33 more and more out ofthe vertical position, the Wheels can be gradually separated, and the cam 32- is so shaped that any position thus given to the wheel 14' will be preserved Without the necessity of further attention. When the machine is not in use, the Wheels, are thus kept out of Contact, which will lessen wear and tear.

What I claim iS- In a machine of the class described, a polishing wheel having an annular cavity on its face near its rim, a live rubber cushion Within said cavity projecting above the edges'of said cavity, and an annular coverthe face -of said cushionv and tucked down between the sides thereof and the sides of said cavity so as to wedge said cushion tightly in place, substantially as described. 40v n ing strip of suitable material placed over 

